Okay then, let's sum up this "argument".
Screencapping if you're a normal user who just wants to post images somewhere:
1. Just screencap it and don't care about incorrect aspect ratio with anamorphic material screencaps
2. If you really care about it, there's multiple equally slow ways to make the image correct aspect ratio
3. Don't use PNG, use JPG.
If you are going to make a screencap comparison of the video quality:
1. Use FFDShow's grab to get the decoded image
2. Use PNG.
Made the subtitles disappear how?